Thread-holding mechanism for sewing-machines.



PATENTED APR. 26,1904.

1. H. & J. B. URSBRUGK. THREAD HOLDING MECHANISM FOR SEWING MACHINES.

APPLIUATIOR FILED D110. 6. 1902.

H0 MODEL.

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UNITED STATES v Patented April 2%, 1904;

PATENT OFFICE.

JOHN H. URSBRUCK AND JOSEPH B. URSBRUCK, OF PHILADELPHIA, V

PENNSYLVANIA, ASSIGNORS OF ONE-HALF TO OHN A. HUNTER AND MARY A. HUNTER, OF PHILADELPHIA, PENNSYLVANIA.

THREAD-HOLDING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 758,121, dated April 26, 1904.

Original application filed August 6, 1900, Serial No. 26,071. Divided azudthis application filed December 6, 1902. Serial forming a part of this specification. 7

The invention to be hereinafter described relates to thread-holding mechanism more especially adapted for holding the under thread of a lock-stitch sewing-machinesuch, for instance, as described in our former application,

Serial N 0. 26,071, filed August 6, 1900, of which the present application is a division, and on which former application Letters Patent of the United States No. 715,323, dated December 9, 1902, wereissued to us.

The object of the present invention is to provide a holder of the character referred to which will be simple in construction and yet provide for a ready and convenient passage of the thread between the case of said holder and the supporting parts thereof. It is essential in this class of devices that while the case for containing the thread shall'be held in proper position it yet shall present no obstruction to the convenient and ready passage of the loop of thread which is to pass about the same to complete the lock-stitch; and with these general objects in view the invention in the present embodiment thereof consists of the parts and combinations, as will hereinafter be more fully described, and definitely pointed out in the claims.

In the drawings, Figure 1 shows in side elevation our improved thread-holding mechanism disposed with relation to the parts with which it coacts and as more fully described in our previous application hereinbefore referred to. Fig. 2 is a partial sectional view of said holding mechanism on an enlarged scale, and Fig. 3 is a sectional detail of the case to be referred to.

(No model.)

The purpose ofour present construction is to provide means for holding the under thread in a lock-stitch machine of the character set forth in our previous application, to which a pair of rings 121 122, so that the case is.

closely confined between them, the case hav' ing at'the bottom an antifriction-roller 151, which rests in a groove in the bar 123, secured to a bracket 124 on the fixed frame of the machine. 124 is a stud 125, .which'has at the outer end a thumb-nut 126, the latter bearing upon a tubular projection 127 on the base 128 of the ring 122, as shown in Fig. 2. There is suflicient space between the bobbin-caseand the rings 121122 to permit the free passage around the bobbin-case of the loop of the thread; but in order to hold the upper end of the bobbin-case in its proper central position between the rings 121 122, and yet permit the loop of needle-thread to pass over the same, we provide the upper portion of each of'the retaining-rings 121 122 with a toothed disk 130, the teeth of the disk entering grooves 152 in the conical sides of the bobbin-case 120,

so as to prevent any lateral or longitudinal movement of the same, whereby the apex of said bobbin-case is always in the proper central position for receiving the loop, which is drawn from the needle and is prevented from being drawn out of its holder by the pull of the loop upon it. As the loop is slipped over the bobbin-case the thread comes in contact with the teeth of the disk 130, and the latter turns, so as not to interfere with the movement of the thread, and the loop slips under the roller 151, mounted in the lower part of the case, as said loop is withdrawn from around the bobbin-case.

It will be noted that by the arrangement reference may-be had, and the thread-holding Projecting from the bracket a washer, as 128 and when the parts thus separated by the washer are drawn firmly together by the screw-bolt they efficiently support the rings 121 and 122 in proper relation with each other.

The parts such as the hook 131, its supporting-arm 132, and part 126 are as shown and fully described in our application hereinbefore referred to and to which reference may be had, such parts requiring no full description in this connection.

From the construction thus far described it will be noted that the rings 121 and 122 provide'a supporting or retaining means for the bobbin-case which is free from contact with said case, the latter being supported by resting by the roller 1-51 upon the arm 123 and at its upper end by the toothed disks 130. These disks not only support the case from sidewise or lateral movement between them, but by entering the recesses 152 in the upper part of the case they effectually prevent any rolling or longitudinal movement of the case. Thus while the case is supported at practically only its top and bottom portions, it is effectually prevented from any undesirable movement,

and yet its supporting devices do not interfere with the proper passing of the loop of thread around the case.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. The combination, in a sewing-machine, of a case or holder for containing the underthread bobbin. a pair of parallel fixed rings forming a cage or holder for the bobbin case,

said parts being so arranged relatively as to permit the free passage around the bobbincase of the loop of the thread, with means to support the bobbin-case centrally therein consisting of a rotatable disk between each ring and the bobbin-case; substantially as devided with a toothed and rotating element engaging with the upper portion of the bobbincase, whereby the bobbin-case is held within its retaining cage or holder, free from both lateral and longitudinal movement, and without interference with the drawing of the loop of needle-thread around the same; substantially as described.

3. The combination in a sewing-machine, of a case for containing the under-thread bobbin, a retaining cage or holder for said case free from contact with the same but provided with toothed and rotating disks engaging with recesses at the upper portion of the bobbin case, means to vertically support the base of the bobbin-case, without appreciable friction, within'the cage or holder; and means to adjustably and removably support the cageor holder from the fixed frame of the machine.

In testimony whereof we have hereunto affixed our signatures this 1st day of December,

JOHN H. URSBRUCK. JOSEPH B. URSBRUCK. Witnesses:

Gno. W. REED, A. M'. BIDDLE. 

